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An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly. This is also called an arrhythmia. Within the heart is a complex system of valves, nodes, and chambers that control how and when the blood is pumped. An abnormal heart rhythm is when your heart beats too fast, slow, or irregularly.
Heart block affects the heart's ability to pump blood and the body's blood pressure, and can cause an abnormally slow heart rhythm called bradycardia. An implanted artificial pacemaker can restore a normal heart rate and rhythm. Heart block may cause the following symptoms: Chest pressure or pain; Fainting, also known as syncope, or near-syncope; Fatigue